texinfo: new host package

texinfo: new host package

We have tried multiple solutions to solve the "makeinfo" problem in
binutils and gdb, without finding anything really convincing. So it
seems like the easiest solution is to add a texinfo host package, and
use it as a dependency of binutils/gdb when they are fetched from
Git. This commit introduces just the host-texinfo package.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>